rockchip: rk3399: enable arm trust firmware

BRANCH=none
BUG=chrome-os-partner:51537
TEST=kernel is not stuck anymore and can boot into prompt,
     (testing with others patches)

Change-Id: I74bdfa0ce608044a554bb3b06ed17b7157260294
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ca4e7a50c989ae0eff270df4fa160b80a172af31
Original-Change-Id: Id95d5f282ba49981f8e33da029e8710cd4087945
Original-Signed-off-by: Lin Huang <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/332561
Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org>
Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/14719
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed